弥勒褐煤提取腐植酸的工艺优化研究

Study on optimization of process conditions for extracting humic acid from Mile lignite

根据响应曲面法的Box-Behnken模板设计原理进行了3因素3水平的实验条件设计,以焦磷酸钠溶液浓度、反应时间和反应温度作为因素变量,以腐植酸提取率为响应值,采用响应曲面法建立数学模型,考察因素之间的交互作用对腐植酸提取率的影响,获取了最优的腐植酸提取工艺条件。结果表明,3个因素以及两两因素之间的交互作用对腐植酸的提取率均有比较明显的影响。根据数学函数模型得出弥勒褐煤提取腐植酸的最优工艺为:焦磷酸钠溶液浓度为0.03 mol/L,反应时间为1.60 h,反应温度为96℃,此时的模型预测值为95.83%,进行验证实验得到腐植酸的提取率为95.68%,与此模型的吻合性较好。

According to the Box-Behnken design principle of response surface methodology(RSM),the experimental conditions of three factors and three levels are designed.Taking sodium pyrophosphate solution concentration,reaction time and reaction temperature as the factor variables,the HA extraction rate is used as the response value,and the RSM is used to establish the mathematical model to investigate the interaction between the factors on the HA extraction rate,so that obtain optimal extraction process conditions of HA.The results show that the three factors and the interaction between the two factors have a significant impact on the extraction rate of humic acid.According to the mathematical function model,the optimal process for extracting HA from ML are as follows:the concentration of sodium pyrophosphate solution is 0.03 mol/L,the reaction time is 1.60 h,and the reaction temperature is 96℃.The predicted value of the model is 95.83%.The extraction rate of HA obtained by the verification test is 95.68%,which is consistent with this model.